Gaspari BCAA 6000 from Gaspari Nutrition uses a "leucine heavy", 4:1:1 ratio of 100% pure high-grade branched chain amino acids in a formula that provides clinically suggested and effective quantities of these critical nutrients in every dose. The branched chain amino acids (BCAA's) got their names due to their unique molecular structure that are different from the other amino acids. All BCAA's are considered "essential amino acids" because your body can't synthesize them from other compounds and they must be obtained through your diet. Bodybuilders and other high level, advanced athletes have known for years that the BCAA's are responsible for helping to support increased protein synthesis which may lead to faster recovery time, increased lean muscle mass and increased performance and endurance all around. The addition of advanced, highly bio-available forms of Vitamin B-6 and Vitamin B-12 to the BCAA 6000 complex may also help to enhance your energy levels and endurance helping to further maximize your training while simultaneously supporting recovery